1. HARD

\((-13) - (-25) =\)

  1. -38
  2. 13
  3. -12
  4. 12
  5. 38
 
2. HARD

\((-19) + (-25) =\)

  1. 44
  2. -44
  3. 6
  4. -6
  5. 35
 
3. HARD

\((-13) - 62 =\)

 
4. HARD

\(72 + (-94) =\)